Clone

A clone is an organism that is genetically identical to its ancestor. Clones could be produced via asexual reproduction, or through technology. Though usually an exact duplicate, some clones were modified to differ from their ancestor.

The Mariposa colony was inhabited entirely by clones of the five original settlers. Since the colonists knew that two women and three men could not sustain a society, they looked to science to survive and turned to cloning. Future generations later referred to them as the "progenitors". However, by the 24th century the colony's survival was threatened by their limited genetic diversity because of a phenomenon known as replicative fading. In 2365, the USS Enterprise-D introduced new genetic material to Mariposa in the form of the colonists of Bringloid V. (TNG: "Up The Long Ladder")

Spock with Spock Two

In 2269, Stavos Keniclius 5, himself a clone, created a giant clone of Spock called Spock Two on Phylos. Spock Two was several times bigger than the original Spock. Keniclius intended to create a master race of peacekeepers based on Spock's genetic template, but abandoned the idea when he learned that peace keeping was not necessary in the Federation. (TAS: "The Infinite Vulcan")

By the 24th century the aspect of cloning seemed repulsive to some Humans, considered to eliminate the aspect of one's uniqueness and specialty. When offered the chance to be cloned, William T. Riker claimed that a hundred or a thousand of Rikers would diminish that status. (TNG: "Up The Long Ladder")

In 2369, Ibudan created a clone of himself and killed it in order to implicate Odo. However, his plan was discovered and he was arrested for murder, as under Bajoran law killing one's own clone is an equal crime to other forms of homicide. In the meantime, a second clone of Ibudan was created in Bashir's infirmary and went on to make a new life for itself. (DS9: "A Man Alone")